This is typical of a keyboard that is failing. Your laptop is probably still within its three year warranty so I would contact Dell tech support and talk to them about a repair. They will likely want you to run their diagnostic on the blue drivers & diagnostic CD that came with the laptop so you would save time by running that first. All you do is place the CD in the CD drive, turn the laptop on and hit the F12 button when prompted but before the Windows start screen appears. The CD is self booting so when you are prompted hit a key to boot from the CD and start the diagnostics program. Select the keyboard test, run it and document the results at the end.
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I had a similar problem after replacing a damaged keyboard, turned out that the ribbon cable kept pulling slightly from its socket each time i replaced the keyboard, try lifting the keyboard gently and check that the ribbon cable is fully inserted correctly.

you disabled keyboard in fn mode press fn blue key and hold down and locate the little blue key on keyboard and press it release at same time if that dont work restore to earlier point using on screen keyboard and problem should be fixed

It is possible that something was spilled on the keyboard (like juice) and now they won't work anymore. In this case, if you have a normal keyboard you can open it up and clean it or take to a repair shop or just buy a new one. If you have a laptop it's a bit tricky because if you haven't done this before it's more difficult to open it and clean it. So if that's the case take it to a repair shop and they will clean it OR tell you what it's wrong with it.I presumed there was something spilled on the keyboard. If that's 100% not the case you might want to provide more detail because I can't think of another reason for this to happen. Haven't found anything relevant on the internet either.

It sounds like the electronic circuit of the keyboard may be failing but to be sure it isn't something simple like a small amount of fluid getting under the keys and acting like a wire to conduct the signal from one set of letters to another. I would remove the keyboard and using compressed air, clean the keyboard with short bursts. The take a Q-tip and alcholhol and run the q-tip under each key to clear away fluid, dirt and debris. If this fails, then I would recomment keyboard replacement.